LAS VEGAS — A Nevada sheriff says one on-duty officer is in critical condition and another was wounded in the Las Vegas concert shooting that left more than 50 people dead, including two officers.

Las Vegas police stand guard along the streets outside the the Route 91 Harvest country music festival grounds after a active shooter was reported on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)

Several officers from California were attending the outdoor Route 91 Harvest Music Festival on Sunday when a gunman opened fire. A Bakersfield Police officer was shot and taken to the hospital with non-life threatening injuries.

Authorities have not released any of their identities.

As of Monday morning, the death toll had climbed to 58. More than 500 people were injured.

Lombardo says the suspect, identified as Stephen Paddock, is dead. The sheriff says they believe this was a “lone wolf” attack and though Islamic State terror group claimed responsibility for the shooting, the FBI says there is currently “no connection” between the gunman and any international terror organizations.